Sr. Principal Module Design Engineer
Coherent
Listing collected from Coherent's career site. NextChapter is independent of Coherent.
Fremont, CA · Posted July 9, 2026
Just laid off? Start here: a plan for the first weeks
Want recruiters in Engineering to be able to find you?
Roles at this level, like this one at Coherent, are often filled through recruiters.
See every open role at Coherent
More in California job market · Manufacturing & Industrial · Engineering jobs
More roles at Coherent
- Sr. Director, Architectural Solutions · Santa Clara, CA
- Principal Reliability Engineer · Horsham, PA
- Principal Quality Engineer-Optical Systems · Sunnyvale, CA
- Senior Principal Process Engineer · Sunnyvale, CA
- Principal Silicon Photonics Design Engineer · Horsham, PA
- Principal Photonics Design Engineer · Fremont, CA
Similar jobs
- Senior Datacenter Product Development Engineer · Nvidia · Santa Clara, CA
- Principal Engineer Applications · Infineon Technologies · El Segundo, CA
- Principal Applications Engineer-18885 · Synopsys · Sunnyvale, CA
- Principal Applications Engineer - Physical Verification · Synopsys · Sunnyvale, CA
- Principal Product Engineer · Rambus · San Jose, CA
- Thermal Design Engineer - Lead Principal · Infineon Technologies · San Jose, CA
Where Fremont, CA ranks
Where Fremont, CA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #13Cities with the most hybrid jobs in the West Coast15% · of 66
- #15Best cities for mid-career professionals in the West Coast59% · of 71
- #17Best cities for technology pay after cost of living$181k · of 80
- #17Best cities for pay after cost of living in California$152k · of 32
- #17Best cities for software and engineering jobs in the West Coast226 openings · of 60
- #18Best all-round cities for mid-career professionals in the West Coast51 / 100 · of 39
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
How AI is used in this kind of work
AI use among mechanical engineers is little observed so far. Measured exposure for mechanical engineers: 8% (little observed).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
About the job
Primary Duties & Responsibilities
Design and develop fiber optic transceivers, CPO and NPO Optical Engines. Drive optical engine product design activities from initial concept to production.
Develop Silicon Photonic (PIC), electronics IC (including TIA, driver, and micro-controller), substrate, optical connector, and packaging co-design to achieve required mechanical and thermal performance.
Execute analysis, modeling, simulation, and measurement of optical and electrical performance.
Work closely with firmware, optical, mechanical, and process engineering to develop products per customer requirements.
Must have in-depth understanding/intuition of electrical engineering solution to RF, power, noise, control, thermal and EMI.
Create drawings, BOMS and ECO to document design. Interact with program manager, buyer/planner, suppliers to ensure designed parts are available in a timely manner for engineering and pilot builds.
Resolve all DFMs from process/production engineering and component suppliers.
Perform module design review for Architectural, EVT, DVT phase review.
Education & Experience
Bachelor’s degree with 7 years of related experience in optical transceiver electrical design.
Or Master’s degree with 5 years; or a PhD with 3 years experience.
Skills & Other Requirements
Strong analog circuit design skills required
Strong understanding of circuit theory, linear system theory, feedback, ICs, and high-speed signal fundamentals required
Strong laboratory measurement skills required
Experience with board level design cycle
Experience with electronics CAD tools and electronic system modelling
Expertise in RF design using modeling tools such as CST or HFSS a plus
Understanding of microprocessors and real time control firmware a plus
Familiarity with fiber optic transceivers and CPO/NPO modules a plus.
Working Conditions
This position is on-site full time.
May require occasional off-site meetings or travel
Regular use of a computer and other office equipment is necessary
Interaction with team members and external contacts is a regular part of the job
May require occasional overtime and flexibility in work hours to accommodate the executive’s needs
Physical Requirements
Sitting for extended periods while working on a computer or conducting meetings.
Use of hands and fingers for typing, writing, and handling documents.
Occasional lifting of objects or materials up to 20 pounds for administrative tasks.
Ability to communicate verbally and in writing.
Mobility within the office environment to attend meetings or interact with colleagues.
Safety Requirements
All employees are required to attend scheduled training, follow the site EHS procedures and Corporate EHS standards. This includes the use of proper protective equipment (PPE) as required by the job responsibilities.
Managers will ensure that all safety and environmental procedures are followed consistently. They will ensure that risk assessments are performed, proper training, work instructions, required PPE is available, and will monitor compliance.
Quality and Environmental Responsibilities
Depending on location, this position may be responsible for the execution and maintenance of the ISO 9000, 9001, 14001 and/or other applicable standards that may apply to the relevant roles and responsibilities within the Quality Management System and Environmental Management System.
Culture Commitment
Ensure adherence to company’s values (ICARE) in all aspects of your position at Coherent Corp.:
I ntegrity – Create an Environment of Trust
C ollaboration – Innovate Through the Sharing of Ideas
A ccountability – Own the Process and the Outcome
R espect – Recognize the Value in Everyone
E nthusiasm – Find a Sense of Purpose in Work
Coherent Corp. is an equal opportunity/affirmative action employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.
If you need assistance or an accommodation due to a disability, you may contact us at talentacquisition@coherent.com .
#LI-AW1
#IND
Coherent is a global leader in lasers, engineered materials and networking components. We are a vertically integrated manufacturing company that develops innovative products for diversified applications in the industrial, optical communications, military, life sciences, semiconductor equipment, and consumer markets. Coherent provides a comprehensive career development platform within an environment that challenges employees to perform at their best, while rewarding excellence and hard-work through a competitive compensation program. It's an exciting opportunity to work for a company that offers stability, longevity and growth. Come Join Us!
Note to recruiters and employment agencies: We will not pay for unsolicited resumes from recruiters and employment agencies unless we have a signed agreement and have required assistance, in writing, for a specific opening.